> PS: one key is that one can set the main #callback: (in which the updater > receives the canvas) *and* then N #callback:value: per suajax this was new > for me. Yes, I see. The documentation is not all that obvious on that. Maybe the library should also be stricter on the #numArgs of blocks. Lukas -- Lukas Renggli http://www.lukas-renggli.ch